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Time Travel Debugging

Time Travel refers to the ability to record a tab and later replay it ([WebReplay][wrr]). The technology is useful for local development, where you might want to:

  • pause and step forwards or backwards
  • pause and rewind to a prior state
  • rewind to the time a console message was logged
  • rewind to the time an element had a certain style or layout
  • rewind to the time a network asset loaded

Block 5 Phone Presser


James Gleeson, SpaceX PR: Quick thank you to everyone for joining us on today's call. We're just a little over two hours from the launch of the Bangabandhu satellite's mission and the first flight of Falcon 9 Block 5. We have about 30 minutes for today's call to discuss the upgrades made to the Falcon 9 launch vehicle, and we'd like to get through as many of your questions as possible in that time. So to keep the conversation flowing, please limit your

gricard /
Last active Jun 14, 2019
Just some notes about my attempt to upgrade to webpack 4

If you enjoyed reading this, I'm intending to do more blogging like this over here:

This is not a complaint about Webpack or v4 in any way. This is just a record of my process trying it out so I could provide feedback to the webpack team

Hmm... I don't see any docs for 4.0 on I guess I'll just wing it. All I need to do is npm i -D webpack@next, right?

+ webpack@4.0.0-beta.2
kfatehi / hb_all_books_dl.js
Last active Oct 19, 2019 — forked from graymouser/hb_all_books_dl.js
Humble bundle book bundles - download all books at once
View hb_all_books_dl.js
After purchasing a humble book bundle, go to your download page for that bundle.
Open a console window for the page and paste in the below javascript
this fork downloads all formats and does so without using jquery (since that didnt work for me)
note that if you are in chrome, chrome will not download the pdfs for you by default, to fix this
type “about:plugins” in the address bar and disable chrome's pdf viewer
var pattern = /(MOBI|EPUB|PDF)$/i;
JanMiksovsky / realTemplate.html
Created Oct 2, 2015
Create a Polymer element using a real <template>, not a <dom-module>
View realTemplate.html
<!DOCTYPE html>
<meta charset="utf-8">
<link rel="import" href="../components/polymer/polymer.html">
<template id="test-element">
Hello, <content></content>.
View bling.js
/* bling.js */
window.$ = document.querySelectorAll.bind(document);
Node.prototype.on = window.on = function (name, fn) {
this.addEventListener(name, fn);
NodeList.prototype.__proto__ = Array.prototype;
View gist:598fa75e22bdfa44cf47

2015-01-29 Unofficial Relay FAQ

Compilation of questions and answers about Relay from React.js Conf.

Disclaimer: I work on Relay at Facebook. Relay is a complex system on which we're iterating aggressively. I'll do my best here to provide accurate, useful answers, but the details are subject to change. I may also be wrong. Feedback and additional questions are welcome.

What is Relay?

Relay is a new framework from Facebook that provides data-fetching functionality for React applications. It was announced at React.js Conf (January 2015).

psayre23 / gist:c30a821239f4818b0709
Last active Oct 20, 2019
Runtime Complexity of Java Collections
View gist:c30a821239f4818b0709
Below are the Big O performance of common functions of different Java Collections.
List | Add | Remove | Get | Contains | Next | Data Structure
ArrayList | O(1) | O(n) | O(1) | O(n) | O(1) | Array
LinkedList | O(1) | O(1) | O(n) | O(n) | O(1) | Linked List
CopyOnWriteArrayList | O(n) | O(n) | O(1) | O(n) | O(1) | Array
matthewmueller /
Last active Oct 13, 2019
OSX for Hackers (Mavericks/Yosemite)
# OSX for Hackers (Mavericks/Yosemite)
# Source:
# Some things taken from here
# Ask for the administrator password upfront
show_usage () {
echo "Usage: `basename $0` [START [END]]"
echo "Steps through the commit history from START to END,"
echo "then returns to the branch or commit from before execution."
echo "START defaults to the root commit (beginning of history)."
echo "END defaults to current branch/commit."
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